Replacing connecting rod bearing shells (BMW X5 E53)

Note: The connecting rod head bearing is different from the connecting rod cap bearing. Please pay attention to the crankshaft oversize.

Checking the radial clearance (0.020–0.055 mm) and replacing the crankshaft connecting rod bearing liners should be carried out in the same way as replacing the main bearing liners, taking into account the following.

Prepare the equipment "00.2.590", "00.9.120" and "11.2.110" and remove the pistons. Into the cover (12, see Fig. 3.11) install a new standard insert (11) with a red marking into the connecting rod, install an insert (10) with a blue marking into the lower head of the connecting rod (8) (regardless of the color marking of the connecting rod).



Install the pistons into the cylinder block and check the radial clearance (left arrow, Fig. 3.93) by flattening the calibration wire between the liners and the connecting rod journal, which should be within 0.020-0.055 mm.







The connecting rod head caps are matched to the connecting rod and cannot be disassembled. The order of tightening the connecting rod bearing cap bolts is as follows:

• tighten to 5.0 km (0.5 kgf·m);
• tighten to 20.0 Nm (20 kgf·m);
• tighten the bolts to an angle of 70°.

For this purpose, use the old connecting rod cap bolts; to tighten the bolts, use the "00.9.120" or "11.2.110" device.

Caution! When tightening the bolts, do not allow the connecting rod or crankshaft to shift.

Remove the connecting rod bearing cap and measure the radial clearance using the width of a flattened plastic gauge wire (arrow, see Fig. 3.92) according to the measuring scale.



If necessary, to adjust the radial clearance in the bearing, use new bearing shells or shells with a different color marking. Tighten the connecting rod cap bolts in three stages, as indicated above.